Electro Magnetic Induction And Alternating Currents Question 95

Question: In an ac circuit, the current is given by $ i=5\sin ,( 100,t-\frac{\pi }{2} ) $ and the ac potential is $ V=200\sin ,(100),volt. $ Then the power consumption is [CBSE PMT 1995; MH CET 1999; CPMT 2002]

Options:

A) 20 watts

B) 40 watts

C) 1000 watts

D) 0 watt

Show Answer

Answer:

Correct Answer: D

Solution:

$ P=Vi\cos \varphi $ Phase difference $ \varphi =\frac{\pi }{2}\Rightarrow P=zero $



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